<?php

/**
 * UserIdentity represents the data needed to identity a user.
 * It contains the authentication method that checks if the provided
 * data can identity the user.
 */
class UserIdentity extends CUserIdentity {
	private $_id;
	/**
	 * Authenticates a user.
	 * The example implementation makes sure if the username and password
	 * are both 'demo'.
	 * In practical applications, this should be changed to authenticate
	 * against some persistent user identity storage (e.g. database).
	 * @return boolean whether authentication succeeds.
	 */

	public function authenticate(){
		$user = User::model() -> findByAttributes(array('name' => $this -> username));
		if ($user === null) {// kiem tra co user theo username nhap vao ko
			$this -> errorCode = self::ERROR_USERNAME_INVALID;
		} 
		else { // neu co
			if ($user -> password !== $user -> encrypt($this -> password)) { // neu password khong khop
				$this -> errorCode = self::ERROR_PASSWORD_INVALID;
			} 
			else {
				$this -> _id = $user -> id;
				if (null === $user -> last_login_time) {
					$lastLogin = time();
				} else {
					$lastLogin = strtotime($user -> last_login_time);
				}
				$this -> setState('lastLoginTime', $lastLogin);
				$this -> errorCode = self::ERROR_NONE;
			}
		}
		return !$this -> errorCode;
	}
}